Cutting mechanism for button-hole sewing-machines



(No Model.) 7 2 SheetsSheet 1,

J G.GR E ENB. I GUTTING MECHANISM FOR BUTTON HOLE SEWING MACHINES. No. 351,760. Patented Nov. 2-, 1886.

N. PETERS. Phokrlilhognpher, Washington. 04 C.

(No Model.) '2 Sheets-QSheet 2Q I J. GQGREBNE; CUTTING MEGHANISMIFORBUTTON HOLE SEWING MACHINES. No. 351,760. Patented Nov. 2, 1886.

WITNESSES:

UNITED S ES PATENT OFFICE.

JAMES e. GR ENE, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY oENEw JERSEY.

CUTTING MECHANISM FOR BUTTON-HOLE SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 351,760Jdated November 2, 1886; Application filed April 2, 1886. Serial No. 197,508. (No model.)

To all whom it may concern:

- Be it known that I, JAMES G. GREENE, a citizen of the United States, residing at Elizabeth, in the county of :Union and State of New Jersey, have invented certain new and useful Improvements in Cutting Mechanism for Button-Hole Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to certain improvements in the cutting mechanism for buttonhole sewing-machines described in Patent No. 322,428, dated July 21, 1885, the object of my invention being to relieve the bed-plate of the machine of the shock or jar of the striking button-hole cutter or cutting-lever. To this end I provide beneath the bed-plate of the machine a sustaining-block,which extends under the forward end of the rock-shaft by which the.

cutting mechanism is operated, so that the said 7 shaft may besupported by the said sustainingblock when the cutting-blow is given, thus transferring the force of the blow to the said block, and thereby relieving the bed-platefrom the shock thereof. I

In the drawings, Figuris 1 and 2 are side views, partly in section, ofsufficient ofa button-hole sewing-machine to illustrate my in-, vention, the parts being in different positions in the two views. Fig. 3is a detail end View, I

the parts therein shown being in the same position as in Fig. 1,'and Fig. 4is'a view similar to Fig. 3, but with the parts in the position indicated by Fig. 2. Fig. 5 is an end view of the bed-plate, partly in section; and Figs. 6, 7, and 8 are views similar to Figs. 2, 3. and 4, respectively, illustrating a modified form of my invention.

A denotes the bedplate, and B a portion of the arm of a button-hole sewing-machine.

G is a rockshaft supported by center-screws passing through hangers (1, depending from the bed-plate A, said shaft being connectedby a link, d, with a striking cutting-lever, D, hav-' ing at its forward end a weighted head carrying a cutting-block, d. The shaft 0 is provided at its rear end with an operating-handle, c, and at its forward end with a cam, c.

Pivoted to earsa'on the bed-plate A is an arm or lever, G, which rests on the cam c,

manner as in the machine described in the said patent.

To relieve the bed-plate of. the shock of the blows of the cutting-lever, and thus prevent the mechanism carried by the said plate from being disarranged or otherwise injured by such shock, I-provide a sustaining-block, F, which is arranged beneath the lifting-cam c on the rock-shaft G, or, in other words, beneath the forward end of the said shaft. The bed-plate A is hinged at its rear side to standards secured to the table E, andl'prefer to support the front side of said bed plate by a post, f, also securedby said table. In the present instance the standards F" respectively, are

formed integral with the base-pieces f f of thesaid sustaining-block and post. The standardf is not clearly shown, except in Fig. 6, (from which the post 7 is omitted;) but it will be understood that it is or may be of the same form as the standard F (clearly .shown in Fig. 5.) c

On the shaft 0 is a small cam, c", which may be merely an extension of the cam c. When the handle'c is lifted in the operation of cut ting a button hole, the cam c, impinging against the sustaining-block F, (or a cushion or plate, f thereon,) lifts the bed-plate A slightly from the postf, (see Fig. 2,) and the force of the blow of the cutting-lever D will thus be communicated to the said block F, thereby relieving the bed-plate from the shock of the blow.

The lifting of the bed-plate by the cam c on the shaft 0 is due to the fact that the said shaft is rigidly connected with the said bed-plate through the hangers a, by which it is supported, so that as the said shaft is turned in the operation of cutting a button-hole the impingement of the said cam against the block F (or its cush- ICO ion f) forces the said shaft upward, and thus slightly lifts the front side of the bed-plate from the post f, as above stated.

Instead of supporting the front side of the bed-plate by the post-f, as above described, said post, andalso the cam 0, may be omitted, and the forward end of the shaft 0 may rest directly on the block F, which will thus serve as a support for the front side of the bedplate, both when the button-hole is being out and at other times. (See Figs. '6, 7, and 8.) I pro fer, however, to employ the post f and cam e, as hereinbefore described, as with this construetion there will be less friction on the shaft G at the beginning of the movement of thelat' ter in cutting; but I do not wish to be understood as limiting my invention to this my preferred construction.

It will be obvious that-,iustead of arranging the cutter 9 below the bed-plate and the out ting-blockd above the same, the positions of these two parts may be the same as in the pat ent hereinbefore referred to, on which myinvention is an improvement.

Having thus described my invention, I claim and desire to secure by Letters Patent 1. In a button hole sewing-machine, the

combination, with thebed-plate thereof, a striking cutter-lever, a cutting block, a cutter, and a rock-shaft by which the said cutter and block are operated,and which is connected with the said bed-plate, of a sustaining-block below the said -bed-plate and beneath the forward end of the said rock-shalt, whereby when the said outter is operated the force of the blow will be L communicated to the said sustaining-block and the bed-plate relieved of the shock, as set forth. 2. In a button hole sewing machine, the combination, with the hinged bed-plate, a post for supporting the front side thereof, a striking eutterdever, a cuttingblock, a cutter, and a rock-shaft for operating said cutter and block, of a sustaining-block beneath the said bedplate, and a cam on said rock-shaft adapted to impinge against said sustaining-block tolift the front'side of the bed-plate from the said post when the cutter is operated, substantially as and for the purpose set forth.

In testimony whereof Iaffix my signatu re in presence of two witnesses.

JAMES G. GREENE. Witnesses:

PHILIP DIEHL, Josnrn J. PORTER. 

